Despite the fact Ghost platform by itself contains most of necessary functionalities, there are plugins which you can connect to Ghost to extend the functionality of this awesome platform.
- Cove.Chat provides good experience in case if you would like to enable comments for already registered members inside your blog. You don't need anymore to ask your members to login separately. Also can be used as a good tool to convert people into members. The price starts from $8/m, easy setup and good.
- Ghostboard can help you in case if you would like to have easy to use and web analytics for your blog w/o necessaty to do any kind of complex installations custom custom metrics inside Google Analytics or any other analytic tool. Price start from $9/m